Wideband dichroic-filter design for LED-phosphor beam-combining
Abstract
A general method is disclosed of designing two-component dichroic short-pass filters operable for incidence angle distributions over the 0-30.degree. range, and specific preferred embodiments are listed. The method is based on computer optimization algorithms for an N-layer design, specifically the N-dimensional conjugate-gradient minimization of a merit function based on difference from a target transmission spectrum, as well as subsequent cycles of needle synthesis for increasing N. A key feature of the method is the initial filter design, upon which the algorithm proceeds to iterate successive design candidates with smaller merit functions. This initial design, with high-index material H and low-index L, is (0.75 H, 0.5 L, 0.75 H)^m, denoting m (20-30) repetitions of a three-layer motif, giving rise to a filter with N=2 m+1.
- Inventors:
- Issue Date:
- Research Org.:
- Light Prescriptions Innovators, LLC, Altadena, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1176419
- Patent Number(s):
- 7859754
- Application Number:
- 11/982,492
- Assignee:
- Light Prescriptions Innovators, LLC (Altadena, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- DOE Contract Number:
- FC26-05NT42341
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2007 Nov 02
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 97 MATHEMATICS AND COMPUTING
Citation Formats
Falicoff, Waqidi. Wideband dichroic-filter design for LED-phosphor beam-combining. United States: N. p., 2010.
Web.
Falicoff, Waqidi. Wideband dichroic-filter design for LED-phosphor beam-combining. United States.
Falicoff, Waqidi. Tue .
"Wideband dichroic-filter design for LED-phosphor beam-combining". United States. https://www.osti.gov/servlets/purl/1176419.
@article{osti_1176419,
title = {Wideband dichroic-filter design for LED-phosphor beam-combining},
author = {Falicoff, Waqidi},
abstractNote = {A general method is disclosed of designing two-component dichroic short-pass filters operable for incidence angle distributions over the 0-30.degree. range, and specific preferred embodiments are listed. The method is based on computer optimization algorithms for an N-layer design, specifically the N-dimensional conjugate-gradient minimization of a merit function based on difference from a target transmission spectrum, as well as subsequent cycles of needle synthesis for increasing N. A key feature of the method is the initial filter design, upon which the algorithm proceeds to iterate successive design candidates with smaller merit functions. This initial design, with high-index material H and low-index L, is (0.75 H, 0.5 L, 0.75 H)^m, denoting m (20-30) repetitions of a three-layer motif, giving rise to a filter with N=2 m+1.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {12}
}